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- /* threshold_alpha.c -- This is a plug-in for the GIMP (1.0's API)
- * Author: Shuji Narazaki <narazaki@InetQ.or.jp>
- * Time-stamp: <2000-01-09 13:25:30 yasuhiro>
- * Version: 0.13A (the 'A' is for Adam who hacked in greyscale
- * support - don't know if there's a more recent official
- * version)
- *
- * Copyright (C) 1997 Shuji Narazaki <narazaki@InetQ.or.jp>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
- #include "config.h"
-
- #include <stdio.h>
- #include <stdlib.h>
-
- #include <gtk/gtk.h>
-
- #include <libgimp/gimp.h>
- #include <libgimp/gimpui.h>
-
- #include "libgimp/stdplugins-intl.h"
-
-
- #define PLUG_IN_NAME "plug_in_threshold_alpha"
- #define SHORT_NAME "threshold_alpha"
- #define PROGRESS_UPDATE_NUM 100
- #define SCALE_WIDTH 120
-
- static void query (void);
- static void run (gchar *name,
- gint nparams,
- GimpParam *param,
- gint *nreturn_vals,
- GimpParam **return_vals);
-
- static GimpPDBStatusType threshold_alpha (gint32 drawable_id);
-
- static gint threshold_alpha_dialog (void);
- static void threshold_alpha_ok_callback (GtkWidget *widget,
- gpointer data);
-
- GimpPlugInInfo PLUG_IN_INFO =
- {
- NULL, /* init_proc */
- NULL, /* quit_proc */
- query, /* query_proc */
- run, /* run_proc */
- };
-
- typedef struct
- {
- gint threshold;
- } ValueType;
-
- static ValueType VALS =
- {
- 127
- };
-
- typedef struct
- {
- gint run;
- } Interface;
-
- static Interface INTERFACE =
- {
- FALSE
- };
-
- MAIN ()
-
- static void
- query (void)
- {
- static GimpParamDef args [] =
- {
- { GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive"},
- { GIMP_PDB_IMAGE, "image", "Input image (not used)"},
- { GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
- { GIMP_PDB_INT32, "threshold", "Threshold" }
- };
- static gint nargs = sizeof (args) / sizeof (args[0]);
-
- gimp_install_procedure (PLUG_IN_NAME,
- "",
- "",
- "Shuji Narazaki (narazaki@InetQ.or.jp)",
- "Shuji Narazaki",
- "1997",
- N_("<Image>/Image/Alpha/Threshold Alpha..."),
- "RGBA,GRAYA",
- GIMP_PLUGIN,
- nargs, 0,
- args, NULL);
- }
-
- static void
- run (gchar *name,
- gint nparams,
- GimpParam *param,
- gint *nreturn_vals,
- GimpParam **return_vals)
- {
- static GimpParam values[1];
- GimpPDBStatusType status = GIMP_PDB_SUCCESS;
- GimpRunModeType run_mode;
- gint drawable_id;
-
- run_mode = param[0].data.d_int32;
- drawable_id = param[2].data.d_int32;
-
- if (run_mode != GIMP_RUN_INTERACTIVE)
- {
- INIT_I18N();
- }
- else
- {
- INIT_I18N_UI();
- }
-
- *nreturn_vals = 1;
- *return_vals = values;
-
- values[0].type = GIMP_PDB_STATUS;
- values[0].data.d_status = status;
-
- switch (run_mode)
- {
- case GIMP_RUN_INTERACTIVE:
- /* Since a channel might be selected, we must check wheter RGB or not. */
- if (gimp_layer_get_preserve_transparency (drawable_id))
- {
- g_message (_("The layer preserves transparency."));
- return;
- }
- if (!gimp_drawable_is_rgb (drawable_id) &&
- !gimp_drawable_is_gray (drawable_id))
- {
- g_message (_("RGBA/GRAYA drawable is not selected."));
- return;
- }
- gimp_get_data (PLUG_IN_NAME, &VALS);
- if (! threshold_alpha_dialog ())
- return;
- break;
-
- case GIMP_RUN_NONINTERACTIVE:
- if (nparams != 4)
- {
- status = GIMP_PDB_CALLING_ERROR;
- }
- else
- {
- VALS.threshold = param[3].data.d_int32;
- }
- break;
-
- case GIMP_RUN_WITH_LAST_VALS:
- gimp_get_data (PLUG_IN_NAME, &VALS);
- break;
- }
-
- if (status == GIMP_PDB_SUCCESS)
- {
- status = threshold_alpha (drawable_id);
-
- if (run_mode != GIMP_RUN_NONINTERACTIVE)
- gimp_displays_flush ();
- if (run_mode == GIMP_RUN_INTERACTIVE && status == GIMP_PDB_SUCCESS)
- gimp_set_data (PLUG_IN_NAME, &VALS, sizeof (ValueType));
- }
-
- values[0].type = GIMP_PDB_STATUS;
- values[0].data.d_status = status;
- }
-
- static GimpPDBStatusType
- threshold_alpha (gint32 drawable_id)
- {
- GimpDrawable *drawable;
- GimpPixelRgn src_rgn, dest_rgn;
- guchar *src, *dest;
- gpointer pr;
- gint x, y, x1, x2, y1, y2;
- gint gap, total, processed = 0;
-
- drawable = gimp_drawable_get (drawable_id);
- if (! gimp_drawable_has_alpha (drawable_id))
- return GIMP_PDB_EXECUTION_ERROR;
-
- if (gimp_drawable_is_rgb (drawable_id))
- gap = 3;
- else
- gap = 1;
-
- gimp_drawable_mask_bounds (drawable_id, &x1, &y1, &x2, &y2);
- total = (x2 - x1) * (y2 - y1);
- if (total < 1)
- return GIMP_PDB_EXECUTION_ERROR;
-
- gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));
- gimp_pixel_rgn_init (&src_rgn, drawable,
- x1, y1, (x2 - x1), (y2 - y1), FALSE, FALSE);
- gimp_pixel_rgn_init (&dest_rgn, drawable,
- x1, y1, (x2 - x1), (y2 - y1), TRUE, TRUE);
-
- pr = gimp_pixel_rgns_register (2, &src_rgn, &dest_rgn);
- gimp_progress_init (_("Threshold Alpha: Coloring Transparency..."));
-
- for (; pr != NULL; pr = gimp_pixel_rgns_process (pr))
- {
- gint offset, index;
-
- for (y = 0; y < src_rgn.h; y++)
- {
- src = src_rgn.data + y * src_rgn.rowstride;
- dest = dest_rgn.data + y * dest_rgn.rowstride;
- offset = 0;
-
- for (x = 0; x < src_rgn.w; x++)
- {
- for (index = 0; index < gap; index++)
- *dest++ = *src++;
- *dest++ = (VALS.threshold < *src++) ? 255 : 0;
-
- if ((++processed % (total / PROGRESS_UPDATE_NUM + 1)) == 0)
- gimp_progress_update ((gdouble) processed /(gdouble) total);
- }
- }
- }
-
- gimp_progress_update (1.0);
- gimp_drawable_flush (drawable);
- gimp_drawable_merge_shadow (drawable->id, TRUE);
- gimp_drawable_update (drawable->id, x1, y1, (x2 - x1), (y2 - y1));
- gimp_drawable_detach (drawable);
-
- return GIMP_PDB_SUCCESS;
- }
-
- /* dialog stuff */
- static gint
- threshold_alpha_dialog (void)
- {
- GtkWidget *dlg;
- GtkWidget *frame;
- GtkWidget *table;
- GtkObject *adj;
-
- gimp_ui_init ("threshold_alpha", FALSE);
-
- dlg = gimp_dialog_new (_("Threshold Alpha"), "threshold_alpha",
- gimp_standard_help_func, "filters/threshold_alpha.html",
- GTK_WIN_POS_MOUSE,
- FALSE, TRUE, FALSE,
-
- _("OK"), threshold_alpha_ok_callback,
- NULL, NULL, NULL, TRUE, FALSE,
- _("Cancel"), gtk_widget_destroy,
- NULL, 1, NULL, FALSE, TRUE,
-
- NULL);
-
- gtk_signal_connect (GTK_OBJECT (dlg), "destroy",
- GTK_SIGNAL_FUNC (gtk_main_quit),
- NULL);
-
- frame = gtk_frame_new (_("Parameter Settings"));
- gtk_container_set_border_width (GTK_CONTAINER (frame), 6);
- gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), frame, FALSE, FALSE, 0);
- gtk_widget_show (frame);
-
- table = gtk_table_new (1 ,3, FALSE);
- gtk_table_set_col_spacings (GTK_TABLE (table), 4);
- gtk_container_set_border_width (GTK_CONTAINER (table), 4);
- gtk_container_add (GTK_CONTAINER (frame), table);
- gtk_widget_show (table);
-
- adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
- _("Threshold:"), SCALE_WIDTH, 0,
- VALS.threshold, 0, 255, 1, 8, 0,
- TRUE, 0, 0,
- NULL, NULL);
- gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
- GTK_SIGNAL_FUNC (gimp_int_adjustment_update),
- &VALS.threshold);
-
- gtk_widget_show (dlg);
-
- gtk_main ();
- gdk_flush ();
-
- return INTERFACE.run;
- }
-
- static void
- threshold_alpha_ok_callback (GtkWidget *widget,
- gpointer data)
- {
- INTERFACE.run = TRUE;
-
- gtk_widget_destroy (GTK_WIDGET (data));
- }
-